Thank you. I had same problem with a D510 after W 7 install. I found your answer and it worked. My video to TV with S-Video did not work either. I'm not sure if this solved it also but now both sound and video to TV both work. Thabk you.

Download the Sigmatel R99254 driver. Unpack it but cancel the installation process.It will unpack the files and store them in a folder on the hard drive at c:\Dell\drivers\R99254, and that folder will have a subfolder named WDM.

Open Device Manager and expand System devices near the bottom. Find the PCI Device entry with a ? next to it (or if that is not there then look for "Multimedia Audio Controller") . Go to the properties and choose to update the driver. Choose to manually find the driver and don't let Windows look for it. Browse to c:\Dell\drivers\R99254\WDM

Reboot and it should detect some new hardware and one of them should be the Sigmatel.

changed from xp to windows 7 on latitude D510 and lost sound. what can i do?

Sorry for the late reply -- I did not not see your question last week when you posted.

The problem arises because Windows 7 does not have a native audio driver for AC97 audio (AC97 is the out-dated type of audio hardware that is on the motherboard of the Latitude D510). As a result, you have to manually install a Sigmatel audio driver, but because the Sigmatel company went out of business before Win7 came out there is not a Sigmatel driver explicitly for 7. The following instructions should allow you to install a Sigmatel AC97 driver into 7:

Download the Sigmatel R99254 driver. Unpack (unzip) it to but cancel the installation process.The files should unpack to a folder on the hard drive at c:\Dell\drivers\R99254, and that folder will have a subfolder named WDM.

Open Device Manager and expand System devices near the bottom. Find the PCI Device entry with a ? next to it (or if that is not there then look for "Multimedia Audio Controller") . Right click on the name and select "Properties", then choose to update the driver. Choose to manually find the driver and don't let Windows look for it. Browse to c:\Dell\drivers\R99254\WDM.

When you restart the laptop Windows will detect some new hardware and one of them will be the Sigmatel.

go to Microsoft update catalog....enter in Sigmatel you'll find a list of drivers to chose from.

I found a list of about 2 dozens downloads there and selected the one that seemed closest to the Sigmatel R99254 driver. When I downloaded it all I got was a small (254 kb) cabinet file -- no .exe or setup file. So I see 2 problems for the average person who just needs to download a driver:

1. You can't tell which of the 2 dozen downloads is the right one for a particular model, and

2. There is no obvious way to install it.

For most folks it is probably better to just get the normal Sigmatel drivers from Dell . Note that the Sigmatel R99254 is the correct audio driver for 15 old Dell laptop models that have AC97 audio, but there are 23 other old models that use a different Sigmatel driver, the R90698. See section 9 of the Laptop Audio Driver FAQ for a complete list of which models go with each driver, and links to the drivers.

Hey Mr JIMCO. You are a legend, helped me out quite a bit with the Sigmatel audio drivers. Can you also help me find Video and Graphic Media Accelerator drivers for Dell latitude D510 for intel gma 915 for windows 7. Will be forever grateful !! please do reply or email me at <ADMIN NOTE: Email id removed per privacy policy>

Thank you. I had same problem with a D510 after W 7 install. I found your answer and it worked. My video to TV with S-Video did not work either. I'm not sure if this solved it also but now both sound and video to TV both work. Thabk you.